A patient presents to the Emergency Department after sustaining a twisting knee injury while skiing. She felt a pop and was unable to bear weight afterward secondary to pain and a feeling of instability. Shortly after the injury, she noted increased swelling and pain. On examination, she has a moderate effusion and a positive Lachman test. An x-ray was obtained and is shown above (Image 1. Case courtesy of Mikael Häggström, M.D. – Author info – Reusing images, CC0, via Wikimedia Commons).

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30-year-old male presents to the ED with pain over the right shoulder after being assaulted by a bat. The right arm is held in adduction and has a limited range of motion due to pain. An x-ray of the right shoulder was obtained and is shown above (Figure 1. Case courtesy of Dr. Ian Bickle, Radiopaedia.org, rID: 74640).  

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80-year-old male patient brought in by ambulance for a witnessed fall. A cervical collar was placed by EMS because of midline neck pain. The patient is neurologically intact. A CT of the cervical spine was obtained and is shown above (Case courtesy of Dr. Talal F M Abdullah, Radiopaedia.org, rID: 58030).

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